Hinduism is a very deep wisdom.All the scriptures of hinduism is full of knowledge. Saints of hindus created every thing in examples so a normal human being can under stand the science that’s why the made Incarnations of Lord Vishnu which we can relate to modern day evolution?

First Avatar – Matsya(Fish) – Creatures that live solely in water;

Second Avatar – Koorma (Tortoise)– Creatures that could live both in water and land (amphibian);

Third Avatar – Varaaha(Boar) – Creatures that solely live on land (of course with swimming ability);